/*-
 * #%L
 * HAPI FHIR Storage api
 * %%
 * Copyright (C) 2014 - 2025 Smile CDR, Inc.
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */
package ca.uhn.fhir.jpa.api.pid;

import jakarta.annotation.Nonnull;
import jakarta.annotation.Nullable;

import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.Stream;

/**
 * Template for wrapping access to stream supplier in a try-with-resources block.
 */
class AutoClosingStreamTemplate<T> implements StreamTemplate<T> {
	private final Supplier<Stream<T>> myStreamQuery;

	AutoClosingStreamTemplate(Supplier<Stream<T>> theStreamQuery) {
		myStreamQuery = theStreamQuery;
	}

	@Nullable
	@Override
	public <R> R call(@Nonnull Function<Stream<T>, R> theCallback) {
		try (Stream<T> stream = myStreamQuery.get()) {
			return theCallback.apply(stream);
		}
	}
}
